Table 2.

Statistics.

	F	p	η2p
A. Equal probability blocks: collapsed over all trials Group by Reward ANOVA (Fig. 2A(i) displays RTs)
(i) Reward	46.84	<0.001⁎⁎	0.37
(ii) Group	7.2	0.009⁎	0.16
(iii) Reward × Group	3.55	0.076	0.04
B. Equal probability blocks Learning: Learning Rate (from Power Function) ANOVA (Fig. 3A)
(i) Reward	23.98	<0.001⁎⁎	0.23
(ii) Group	1.37	0.25	0.01
(iii) Reward × Group	0.36	0.41	0.004
C. Probabilistic Blocks Learning (Block 3 & 4): Learning Rate (from Power Function) ANOVA [Fig. 3B)
(i) Reward	378.54	<0.001⁎⁎	0.83
(ii) Group	2.64	0.12	0.03
(iii) Reward × Group	0.96	0.33	0.01
D. Probabilistic Block (Fig. 2(ii) displays RTs)
(i) Group	13.12	<0.001⁎⁎	0.14
(ii) Reward	58.64	<0.001⁎⁎	0.42
(iii) Probability Location	219.72	<0.001⁎⁎	0.49
(iv) Probability Location × Reward	0.04	0.82	0.01
(v) Reward × Group	0.96	0.33	0.03
(vi) Probability Location × Group	3.46	0.07	0.05
(vii) Reward × Probability Location × Group	0.51	0.48	0.01
(viii) Trial Type Comparison (green arrows, Fig. 2(ii)
Trial Type	0.11	0.74	0.001
Group	18.22	<0.001⁎⁎	0.19
Trial type × Group	0.02	0.9	<0.001

^⁎⁎Significant at <0.001.

^⁎Significant at <0.01.